VCF file question

[kjaja]

Hi,
What does “Number=A” stand for in the info line form a VCF file below ?

##INFO=<ID=AF,Number=A,Type=Float,Description="Allele Frequency, for each ALT allele, in the same order as listed">

Thanks for your help,

[dpryan]

Quoting from the wiki page VCF wiki, "If the field has one value per alternate allele then this value should be 'A'"